Table 3.
Descriptive statistics for measured truck and vehicle counts before and after the opening of an online grocery delivery service warehouse in a South Bronx neighborhood.
| Site 3 Mean Count (SD) | Site 4 Mean Count (SD) | |||
|---|---|---|---|---|
| Pre-Warehouse Opening | Post-Warehouse Opening | Pre-Warehouse Opening | Post-Warehouse Opening | |
| Trucks | ||||
| Time Window | ||||
| Midnight to 3 AM | 66.2 (28.1) | 63.4 (23.9) | 5.8 (3.1) | 5.4 (3.5) |
| 3 to 6 AM | 126.8 (59.0) | 137.8 (59.4) | 11.4 (4.6) | 10.7 (4.3) |
| 6 to 9 AM | 148.2 (68.0) | 154.5 (67.3) | 17.3 (8.7) | 16.1 (8.5) |
| 9 AM to 12 noon | 217.8(102.4) | 242.5 (109.4) | 16.3 (7.8) | 16.3 (7.9) |
| 12 noon to 3 PM | 268.3 (121.7) | 303.6 (132.8) | 17.0 (7.0) | 19.3 (7.6) |
| 3 to 6 PM | 215.6 (96.9) | 231.2 (102.3) | 14.9 (6.2) | 13.8 (5.7) |
| 6 to 9 PM | 104.6(43.4) | 106.7 (45.1) | 9.8 (4.3) | 8.5 (4.0) |
| 9 PM to Midnight | 63.4(22.4) | 65.1 (19.7) | 7.6 (3.8) | 10.4 (4.1) |
| Vehicles | ||||
| Time Window | ||||
| Midnight to 3 AM | 492.7 (85.0) | 470.6 (79.9) | 55.0 (20.6) | 54.6 (19.8) |
| 3 to 6 AM | 854.8 (282.1) | 908.8 (266.4) | 107.2 (36.5) | 114.5 (34.8) |
| 6 to 9 AM | 1,294.4 (486.5) | 1,354.0 (515.1) | 215.5 (91.5) | 224.9 (98.0) |
| 9 AM to 12 noon | 1,325.9 (363.5) | 1,434.0 (390.7) | 193.2 (71.9) | 195.2 (76.8) |
| 12 noon to 3 PM | 1,445.7 (291.9) | 1,538.8 (317.3) | 202.7 (66.2) | 216.6 (67.1) |
| 3 to 6 PM | 1,429.6 (258.7) | 1,496.1 (264.8) | 222.4 (87.0) | 225.7 (79.9) |
| 6 to 9 PM | 1,078.1 (173.6) | 1,139.6 (183.0) | 126.8 (50.5) | 116.1 (42.3) |
| 9 PM to Midnight | 728.6 (137.4) | 710.7 (111.1) | 81.8 (29.7) | 93.3 (26.8) |
Note: Pre-warehouse Opening time period = June 1, 2017 through September 30, 2018; Post-warehouse Opening time period = October 1, 2018 through May 5, 2019.